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Astronomical unit
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Roughly the average distance from Earth to the Sun, about 150 million kilometres, fixed by convention at exactly 149,597,870,700 metres.
One astronomical unit is roughly the average distance from Earth to the Sun, about 150 million kilometres. The International Astronomical Union fixed it by convention in 2012 as a unit of length equal to exactly 149,597,870,700 metres. It is the working measure for distances inside the Sol system, and the parsec is defined from it in turn.
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